WP4: African Emissions

M. Van Roozendael, C. Fayt, C. Hermans, G. Pinardi, C. Gielen, F. Hendrick, I. De Smedt

BIRA-IASB

Prof. Pierre Nzohabonayo, Rachel Akimana, Eugène NzendakoUniversité du Burundi

AGACC-II Third Progress Meeting, BIRA-IASB, 18 Dec. 2013

AGACC-II Tasks in WP 4

• WP4: African emissions 4.1. Install MAXDOAS instrument in Burundi (Bujumbura) 4.2. Analyse the data for trace gases (NO2, O3, HCHO, glyoxal,

SO2, BrO, H2O) and aerosols 4.3. Study transport of biomass burning plumes, and link with

measurements at Reunion Island

AGACC-II Third Progress Meeting, BIRA-IASB, 18 Dec. 2013

OMI/AURA HCHO, 2007-2009, 01:30 pmDJF MAM

JJA SON

Activities in 2013

AGACC-II Third Progress Meeting, BIRA-IASB, 18 Dec. 2013

• Training of Eugène Nzendako (until Feb. 2013)

• Finalisation and initial calibration of MAXDOAS instrument (until late April 2013)

• Participation to MADCAT international campaign in Mainz (Germany) for testing and validation of MAXDOAS system (June 2013)

Bujumbura (3°S, 30°E)

• Fixing of instrumental problem (Jul-Sep 2013)

• Final calibration, organisation of transfer to Bujumbura (Oct 2013)

• Installation: Nov 2013

Project status 1 year ago (AGACC-II PM2)

AGACC II Kick-off Meeting, BIRA-IASB, 29 Sep. 2011

Visit of M. Van Roozendael and C. Hermans in May 2012 identification of suitable location for installation and discussion of critical issues regarding operation and maintenance of instrument

Supporting infrastructure in preparation (security, power, internet connection, etc). A dedicated room is being build to host the instrument.

Training of local people ongoing at BIRA (Eugène)

MAXDOAS

Installation of MAXDOAS and CIMEL systems

AGACC-II Third Progress Meeting, BIRA-IASB, 18 Dec. 2013

• MAXDOAS and CIMEL sunphotometer installed at University of Bujumbura in November 2013

• Both systems operational since 25 Nov 2013

• Daily data transfer using dedicated internet line (but still part of University network)

CIMEL

MAXDOAS

BIRA room

AGACC-II Third Progress Meeting, BIRA-IASB, 18 Dec. 2013

Functional drawing of the Bujumbura installation

C. Fayt, 2013

Data acquisition, transfer and processing

AGACC-II Third Progress Meeting, BIRA-IASB, 18 Dec. 2013

• Sequences of measurements fully automated– Control of the different devices (sun tracker, filter wheel, CCD) – Sequence of measurements (different elevation angles, dark

currents)– Automatic adjustment of the integration time– Remote control possible in case a problem is detected (VNC)

• Data are downloaded daily by ftp and raw data are stored at BIRA for further processing

• Automated processing chain operational • Rapid control of the quality of the results through

a local web page

First results – spectral fits

AGACC-II Third Progress Meeting, BIRA-IASB, 18 Dec. 2013

The instrument performs nominally. NO2, HCHO, O3, H2O, O4 … spectral signatures are detected with high S/N ratio according to specifications.

First results – slant columns

AGACC-II Third Progress Meeting, BIRA-IASB, 18 Dec. 2013

The instrument performs nominally. NO2, HCHO, O3, H2O, O4 … spectral signatures are detected with high S/N ratio according to specifications.

Thick clouds& rain

HCHO

NO2

O4

First inversions for NO2, HCHO and aerosols

AGACC-II Third Progress Meeting, BIRA-IASB, 18 Dec. 2013

Preliminary – no cloud filt

ering applied yet

Comparison with satellite data (HCHO)

AGACC-II Third Progress Meeting, BIRA-IASB, 18 Dec. 2013

OMI HCHO VCD

DJF2007-2009

• HCHO columns roughly consistent for GOME-2 (09:30 am) and OMI (01:30) no diurnal variation?

• Inter-sensor consistency seems to degrade with time?

• Small but significant seasonal variation• What can we learn from MAXDOAS?

Comparison with satellite data (HCHO)

AGACC-II Third Progress Meeting, BIRA-IASB, 18 Dec. 2013

Comparison with satellite data (HCHO)

AGACC-II Third Progress Meeting, BIRA-IASB, 18 Dec. 2013

Model profiles used in satellite retrievals

MAXDOAS profiles

Comparison with satellite data (HCHO)

AGACC-II Third Progress Meeting, BIRA-IASB, 18 Dec. 2013

Comparison with satellite data (HCHO)

AGACC-II Third Progress Meeting, BIRA-IASB, 18 Dec. 2013

Outlook

AGACC II Kick-off Meeting, BIRA-IASB, 29 Sep. 2011

• Continued data acquisition and processing of MAXDOAS and CIMEL sunphotometer data throughout 2014 (and later)

• Continued data exploitation for NO2, HCHO, glyoxal, O3, BrO, aerosols

• Satellite validation• Dispersion modelling• Look for PhD support for a

scientist in Bujumbura

Thank you to all our colleagues from the University

of Burundi !